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MT5830 TOPICS IN GEOMETRY AND ANALYSISAimsThis module introduces the ideas and techniques in the field of dimension theory applied to chaotic dynamical systems. We will see how to compute the fractal dimension of dynamically dened objects, many of which have an extremely rich `multifractal' structure. The signature dimensional behaviour of such systems is related to the degree of turbulence and intermittency the systems exhibit. The mathematical tools here will come from thermodynamic formalism, which has a parallel with a formalism used in statistical physics. Specifically, thermodynamic formalism gives us invariant measures which live on dynamically dened fractal sets. We will study the dimension of these sets through these measures. Topics include a review of Hausdorff dimension, and introductions to entropy, topological pressure and Bowen's formula. The canonical application is to the class of simple interval maps known as `cookie cutters'. Dimension theory and dynamical systems are active research areas in the school.Objectives To understand, and in standard cases be able to compute, the Hausdorff dimension of probability measures. To apply the ideas of thermodynamic formalism, for example pressure, to standard dynamical systems.  To understand Gibbs measures for uniformly expanding interval maps.  To understand Bowen's formula: what it means in applications and how it can be proved. Syllabus Hausdorff measure and dimension Dynamically dened Cantor sets: the cookie cutter  the Mass distribution principle  ergodic invariant measures  entropy and topological pressure  Gibbs measures and their Hausdorff dimension  Bowen's formula Assessment100% by twoandahalf hour examinationTextbooksEquilibrium States and the Ergodic Theory of Anosov Dieomorphisms: Rufus Bowen, Lect. Notes in Math., vol. 470. Springer;Fractal Geometry: Kenneth Falconer, Wiley; Equilibrium States in Ergodic Theory: Gerhard Keller; Conformal fractals: ergodic theory methods: Feliks Przytycki and Mariusz Urbanski, Cambridge University Press; Dimension Theory in Dynamical Systems: Contemporary Views and Applications: Yakov Pesin, Chicago University Press; An introduction to Ergodic Theory: Peter Walters, Springer. Prerequisite(s)MT4004 or MT4515AvailabilityAcademic year 2012/13 in semester 2 at 10LecturerProf L OlsenClick here to see the University Course Catalogue entry. Revised: PMH (September 2012)
